I have a RadTreeView bound to a collection that contains two types of objects, "Container" and "Item". I use an ItemTemplateSelector to set the correct (Hierarchical)DataTemplate. So far so good, but now I want to style the RadTreeViewItem so I can change selected visual styles and indents and such. I've added an ItemContainerStyle to the RadTreeView, but now the ItemTemplateSelector doesn't work anymore, the RadTreeView is rendered showing type names for all the items.

Is there a way to combine ItemTemplateSelector with an ItemContainerStyle? Should I be using another approach?

My sample code:

I have got an issue when copying to excel from grid using custom Header. The grid has custom headers similar to below
<telerik:GridViewDataColumn x:Name="name1">
 <telerik:GridViewDataColumn.Header>
<Grid>
   <textBlock text = "header1"/>
...
</Grid>

When the data is pasted into excel it prints the name of the column as Grid ( to string invoked on the header).  I tried using CopyingCellClipboardContent event but that only fires for cell values and not for header copying.  I wanted to give my custom header names to be copied across to excel. How can i do that?

Thanks
Avneesh

Hello,

Using components from UI for WPF R2 2017 ... It appears that RadGridView column virtualization is causing some binding errors, which in turn seem to place the GridView in a state where column header bindings fail when those columns are not rendered initially due to virtualization.  For example, the sample below works if EnableColumnVirtualization is set to false, or if the window size is large enough such that all columns are rendered (such as 800 in the example below).

With the Office2016 theme, I'm getting two types of binding errors:
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Telerik.Windows.Controls.RadGridView', AncestorLevel='1''. BindingExpression:Path=DataContext.HeaderText; DataItem=null; target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Telerik.Windows.Controls.GridView.DataCellsPresenter', AncestorLevel='1''. BindingExpression:Path=Foreground; DataItem=null; target element is 'ContentControl' (Name='PART_ContentPresenter'); target property is 'Foreground' (type 'Brush')

(The sample has a single row in the ItemsSource ... real world situations would produce dozens+ of the errors looking for DataCellsPresenter.)

Other themes I've tested just produce the first binding error.

Here's the .xaml:

 

And here's the code:

 

Any assistance would be appreciated.

There is some display error in the png,but someother UI display right Chinese.

What would be the cause?

Thanks。

Hi, RichTextBox is not the list of supported controls for CodedUI, can we expect the support in future, if yes? What could be the

Hello!

I accidentally click the release button so that "https://www.telerik.com/forums/ribbonwindow-no-transparent", I want to help delete it.

 

I use the Material theme in my RibbonWindow.

When I Producing my program.The window has a White border.

I compare it to demo,It seems to be a shadow, but it's no transparent.

I tried to modify the transparency of the window. The window was not transparent, and all the colors were white.

I think the problem is that transparency is replaced by white, what should I do to correct this problem

 

When the PDFViewer is using FixedDocumentPagesPresenter it tends to change position (it jumps to different pages) when a page is rotated and the same thing can also occur when zooming in/out.

To see this, simply open any PDF with more than a few pages - the one I'm currently testing with has 18 pages, move away from the first few pages (e.g. go to page 12), and rotate the page. The position jumps several pages and is restored if you rotate 360 degs.  In my test doc, it jumps to page 16 when rotated 90 / 270 degrees and back to page 12 when rotated 0 / 180 degrees.

There's a similar problem when zooming in, but I think you need a document with a few hundred pages to see this.

It all seems to be fine when using FixedDocumentSinglePageViewPresenter.

Any chance you can fix this?

Thanks.

I would like to determine how many distinct values are shown in a grid column after filtering is applied.

The filter parameter (true) in grid.GetDistinctValues(column, true, null) considers the other columns (but not the specified column).  So this method returns every distinct value for the considered column and is not restricted to just those distinct values that are actually shown in the column as a result of the filtering currently applied to that column as well as to the other columns.

So this method doesn't suit my purpose.

I would like to know the number of distinct values actually shown in a column to support the following two scenarios.  (1) If there are zero distinct values displayed in a column, then the last filtering operation over-constrained the result set and can be undone (with user notification).  (2) If there is only one distinct value, then the column can be hidden and the column-header/single-unique-value pair can be transferred to a "common values" grid.

This approach works well with our datasets.  As the user applies filtering operations, an 8000 row, 65 column datasource typically gets reduced to about 20 rows and 5 to 10 columns each containing more than one distinct value.  All other single-valued columns are displayed in an adjacent common-values grid.

In the grid.FilterDescriptors.CollectionChanged event, I invoke the method which consolidates the common-values.  For this method, I need to know if there is only one distinct value.

Many thanks!

I Have a WindowsService project.In this service when I render any UserControl, the png file is empty.

for test i write the following code to export a TextBlock but result is an empty png file.

protected override void OnCustomCommand(int command)
{
    Export();

    base.OnCustomCommand(command);
}

private void Export()
{
    var thread = new Thread(() =>
    {

        var grid = new Grid();
        grid.Children.Add(new TextBlock() { Text = "ExportTest", FontSize = 60, Background = Brushes.Red, Foreground = Brushes.Blue });
        double widthg = grid.Width > 0 ? grid.Width : 1024;
        double heightg = grid.Height > 0 ? grid.Height : 768;
        grid.Measure(Size.Empty);
        grid.Measure(new Size(widthg, heightg));
        grid.Arrange(new Rect(0, 0, widthg, heightg));
        grid.UpdateLayout();

        var bitmap = new PngBitmapEncoder();
        ExportExtensions.ExportToImage(grid, @"..\ExportTest.png", bitmap);
    });

    thread.SetApartmentState(ApartmentState.STA);
    thread.Start();
    thread.Join();
}

Note: when I run the export function in wpf project, it works perfect.

there is my project:
http://www.mediafire.com/file/aij5sg4zx80yc73/ExportProject.rar
any body can help me?

It seems like there's a limitation to Cluster locations and a bug regarding its Bounds. I noticed that the location of a Cluster is always at the location of the first item added to it. I would expect that it actually would be at the center of all added items. Looking at the ClusterData.Add method it seems like it would be easy to update the Cluster-location there since the bounds are updated each time a new item is added. I tried solving it by overriding the DefaultClusterGenerator like the code below, but then I noticed that the calculation for the Bounds are actually wrong in the ClusterData.Add method. The last Math.Min should be a Math.Max. In the end I had to calculate the Bounds myself, and then update the Cluster Location.